Even as the holidays come barreling toward us, some folks around the globe fear the mythical planet Nibiru may be doing the same and will trigger some unspecified cataclysm on Dec. 21. Notwithstanding the supposed end of the Mayan calendar, however, local agencies seem focused on preparing for more realistic potential threats. Although it may not be the end of the world, Western North Carolina does remain vulnerable to a wide range of natural and human-made catastrophes, including floods, blizzards, fires and even nuclear accidents.